Achillea alpina L.Achillea sibirica Ledeb.
11 photos
The "Siberian yarrow, ITIS lists no varieties or subspecies.
It differs from A. millefolium by having
shorter ray flowers and a leaf which is pinatifid to a lesser degree.

1. August 8, 2007. One of the many pollinators which visit this species.

2. August 8, 2007. Same as above but with an additional visitor

3. August 16, 2014. A. alpina, note the leaf
and the numerous small ray flowers.

4. August 16, 2014. A. alpina above with the
small ray flowers. A. millefolium below with
the larger but less numerous ray flowers.

5 . Late May. Both species of
Achillea
are common roadside plants.

6. Late June. This plant found
in a mined
area is small considering the time of year.
Note the red leaves which are also present
in photo 7. The relatively narrow mid-vein
region and degree of pinnatifidity indicate
that this is millefolium rather than
sibirica.

7. Early July. The leaf is pinnatifid
to
a greater degree at the end

8. August 16, 2014. A. sibirica
on the bottom
and A. millefolium on the top.

9. Early June. The remains of
last year's
growth.

10. Early October. The yarrows
are
sturdy plants and the dead plant will often
be found the following year as seen in
photo 9.